Final Prospectus · 424B4

Ascent Solar Technologies, Inc.

Final Prospectus

Filed Jun 30, 2025Accepted Jun 30, 2025, 10:21 AM EDTCIK 1350102Accession 0001079973-25-001075

Company context

We were incorporated in 2005 from the separation by ITN Energy Systems, Inc. (“ITN”) of its Advanced Photovoltaic Division and all of that division’s key personnel, core technologies, and certain trade secrets and royalty free licenses to use in connection with the manufacturing, developing marketing, and commercializing Copper-Indium-Gallium-diSelenide (“CIGS”) photovoltaic (“PV”) products.